Is homeschooling an option?
What is the age of compulsory education for children where you live?
Is he getting enough out of his current school to justify keeping him there? (Even if the tanturms have subsided, the pain may not have gone away.)

It seems like you are already doing what I would recommend, giving him companionship,attention and materials.

Love and More Love,
Grinity

Coaching available, at SchoolSuccessSolutions.com